US20050043045A1 - Uplink timing in a wireless communications system - Google Patents
Uplink timing in a wireless communications system Download PDFInfo
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- US20050043045A1 US20050043045A1 US10/643,213 US64321303A US2005043045A1 US 20050043045 A1 US20050043045 A1 US 20050043045A1 US 64321303 A US64321303 A US 64321303A US 2005043045 A1 US2005043045 A1 US 2005043045A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
- H04W28/12—Flow control between communication endpoints using signalling between network elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
- H04W56/0095—Synchronisation arrangements determining timing error of reception due to propagation delay estimated based on signal strength
Abstract
A method for controlling the flow of information between a UE and a Node B is provided. The UE transmits over a control channel to the Node B a signal requesting to transmit information to the Node B. The Node B uses information regarding a delay, such as a propagation and/or processing delay, associated with the UE to schedule the transmission of data. The UE then receives over a shared channel from the Node B a signal identifying a time at which the UE is permitted to transmit information. Thereafter, the UE transmits at the identified time over a data channel to the Node B a signal containing the information.
Description
- 1. Field of the Invention
- This invention relates generally to telecommunications, and, more particularly, to wireless communications.
- 2. Description of the Related Art
- In the field of wireless telecommunications, such as cellular telephony, a system typically includes a plurality of Node Bs (e.g., base stations) distributed within an area to be serviced by the system. Various users within the area, fixed or mobile, may then access the system and, thus, other interconnected telecommunications systems, via one or more of the Node Bs. Typically, a UE (e.g., a user) maintains communications with the system as the user passes through an area by communicating with one and then another Node B, as the user moves. The user may communicate with the closest Node B, the Node B with the strongest signal, the Node B with a capacity sufficient to accept communications, etc.
- Commonly, each Node B is constructed to process a plurality of communications sessions with a plurality of users in parallel. In this way, the number of Node Bs may be limited while still providing communications capabilities to a large number of simultaneous users. Typically, each user is generally free to transmit information to the Node B with regard to the interference to other users being controlled properly. That is, multiple users may transmit information to the Node B at the same time. This unregulated transfer of information, however, results in interference between users whose transmissions overlap.
- In systems that transmit voice, or even data at relatively low speeds, the interference caused by overlapping transmissions is controlled to meet the quality of service requirement of the communications session. However, as use of the Internet, e-mail and other data-intensive services have become ubiquitous, wireless communications systems are now attempting to provide some of these same services. These types of services, however, require large amounts of data to be transmitted at relatively high speed. In a system that is intended to transmit large amounts of data at high speed, the interference can be significant. In fact, the interference caused by overlapping transmissions can impose substantial limits on the speed at which data can be transmitted, rendering high-speed data communications unworkable in some instances.
- The present invention is directed to overcoming, or at least reducing, the effects of one or more of the problems set forth above.
- In one aspect of the instant invention, a method is provided . the method comprises associating a delay with a request to transmit information, and transmitting a signal identifying a time at which information is permitted to be transmitted based on the delay.
- In one aspect of the instant invention, a method is provided for controlling a flow of information in a communications system. The method may comprise receiving a signal requesting to transmit information and associating a delay with the request to transmit information. Thereafter, a time is determined at which the information is permitted to be transmitted based on the delay, and a signal identifying the time at which information is permitted to be transmitted is transmitted.
- In another aspect of the instant invention, a method for controlling the flow of information between a user and a base station. The method comprises receiving a synchronizing signal from the base station. A signal is transmitted from the user requesting permission from the base station to transmit information. Thereafter, a signal is received from the base station identifying a time relative to the synchronizing signal at which information is to be transmitted, and then the information is transmitted from the user to the base station at the identified time.
- The invention may be understood by reference to the following description taken in conjunction with the accompanying drawings, in which like reference numerals identify like elements, and in which:
-
FIG. 1 is a block diagram of a communications system, in accordance with one embodiment of the present invention; - FIGS. 2A-B depict a block diagram of one embodiment of a Node B and two UEs used in the communications system of
FIG. 1 ; -
FIG. 3 is a flow diagram illustrating the interoperation of the Node B and the UE ofFIGS. 1 and 2 ; andFIG. 4 is a timing diagram illustrating the interoperation of the Node B and the two UEs ofFIG. 2 . - While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and are herein described in detail. It should be understood, however, that the description herein of specific embodiments is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
- Illustrative embodiments of the invention are described below. In the interest of clarity, not all features of an actual implementation are described in this specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.
- Turning now to the drawings, and specifically referring to
FIG. 1 , acommunications system 100 is illustrated, in accordance with one embodiment of the present invention. For illustrative purposes, thecommunications system 100 ofFIG. 1 is a Universal Mobile Telephone System (UMTS), although it should be understood that the present invention may be applicable to other systems that support data and/or voice communication. Thecommunications system 100 allows one or more UEs 120 to communicate with adata network 125, such as the Internet, through one ormore Node Bs 130. The UE 120 may take the form of any of a variety of devices, including cellular phones, personal digital assistants (PDAs), laptop computers, digital pagers, wireless cards, and any other devices capable of accessing thedata network 125 through the Node B 130. - In one embodiment, a plurality of the
Node Bs 130 may be coupled to a Radio Network Controller (RNC) 138 by one ormore connections 139, such as T1/EI lines or circuits, ATM circuits, cables, optical digital subscriber lines (DSLs), and the like. Although only twoRNCs 138 are illustrated, those skilled in the art will appreciate that a plurality ofRNCs 138 may be utilized to interface with a large number ofNode Bs 130. Generally, the RNC 138 operates to control and coordinate theNode Bs 130 to which it is connected. TheRNC 138 ofFIG. 1 generally provides replication, communications, runtime, and system management services. TheRNC 138, in the illustrated embodiment handles calling processing functions, such as setting and terminating a call path and is capable of determining a data transmission rate on the forward and/or reverse link for eachUE 120 and for each sector supported by each of theNode Bs 130. - The NRC 138 is, in turn, coupled to a Core Network (CN) 165 via a
connection 145, which may take on any of a variety of forms, such as T1/EI lines or circuits, ATM circuits, cables, optical digital subscriber lines (DSLs), and the like. Generally the CN 140 operates as an interface to adata network 125 and/or to a public telephone system (PSTN) 160. The CN 140 performs a variety of functions and operations, such as user authentication, however, a detailed description of the structure and operation of the CN 140 is not necessary to an understanding and appreciation of the instant invention. Accordingly, to avoid unnecessarily obfuscating the instant invention, further details of the CN 140 are not presented herein. - The
data network 125 may be a packet-switched data network, such as a data network according to the Internet Protocol (IP). One version of IP is described in Request for Comments (RFC) 791, entitled “Internet Protocol, ” dated September 1981. Other versions of IP, such as IPv6, or other connectionless, packet-switched standards may also be utilized in further embodiments. A version of IPv6 is described in RFC 2460, entitled “Internet Protocol, Version 6 (IPv6) Specification,” dated December 1998. Thedata network 125 may also include other types of packet-based data networks in further embodiments. Examples of such other packet-based data networks include Asynchronous Transfer Mode (ATM), Frame Relay networks, and the like. - As utilized herein, a “data network” may refer to one or more communication networks, channels, links, or paths, and systems or devices (such as routers) used to route data over such networks, channels, links, or paths.
- Thus, those skilled in the art will appreciate that the
communications system 100 facilitates communications between the UEs 120 and thedata network 125. It should be understood, however, that the configuration of thecommunications system 100 ofFIG. 1 is exemplary in nature, and that fewer or additional components may be employed in other embodiments of thecommunications system 100 without departing from the spirit and skill of the instant invention. For example,system 100 may employ routers (not shown) between theNode Bs 130 and theRNC 138 orCN 165. - Unless specifically stated otherwise, or as is apparent from the discussion, terms such as “processing” or “computing” or “calculating” or “determining” or “displaying” or the like, refer to the action and processes of a computer system, or similar electronic computing device, that manipulates and transforms data represented as physical, electronic quantities within the computer system's registers and memories into other data similarly represented as physical quantities within the computer system's memories or registers or other such information storage, transmission or display devices.
- Referring now to
FIG. 2A , a block diagram of one embodiment of a functional structure associated with anexemplary Node B 130 and a pair ofUEs Node B 130 includes aninterface unit 200, acontroller 210, anantenna 215 and a plurality of types of channels: a sharedchannel type 220, adata channel type 230, and acontrol channel type 240. Theinterface unit 200, in the illustrated embodiment, controls the flow of information between theNode B 130 and the RNC 138 (seeFIG. 1 ). Thecontroller 210 generally operates to control both the transmission and reception of data and control signals over theantenna 215 and the plurality ofchannels RNC 138 via theinterface unit 200. - In the illustrated embodiment, the
UEs UEs UEs UEs UE 120 applies to both of theUEs - The
UE 120 shares certain functional attributes with theNode B 130. For example, theUE 120 includes a controller 250, an antenna 255 and a plurality of channel types: a shared channel type 260, a data channel type 270, and a control channel type 280. The controller 250 generally operates to control both the transmission and reception of data and control signals over the antenna 255 and the plurality of channel types 260, 270, 280. - Normally, the channel types 260, 270, 280 in the
UE 120 communicate with the correspondingchannel types Node B 130. Under the operation of thecontrollers 210, 250 thechannel types 220, 260; 230, 270; 240, 280 are used to effect a controlled time scheduling for communications from theUE 120 to theNode B 130, which is often referred to as an uplink. For example, in one embodiment of the instant invention, theNode B 130 controls theUEs Node B 130 may reduce the amount of interference experienced by reducing or eliminating the amount of time that bothUEs UEs UE 120 to request permission to transmit data and/or control information to theNode B 130. The sharedchannel type 220 is used by theNode B 130 to notify theUE 120 of the circumstances under which it may transmit to theNode B 130 via the data and control channel types 270, 280. That is, theNode B 130 may use the sharedchannel type 220 to notify theUE 120a that it may begin to transmit data at a first preselected time. - Referring now to
FIG. 2B , in the illustrated embodiment, it is anticipated that the shared, data and controlchannel types Node B 130 may be comprised of one or more channels. For example, thedata channel 230 may include a secondary or enhanceddata channel 290. TheUEs 120 may be similarly configured so that an uplink transfer of data from theUE 120 to theNode B 130 may occur over the enhanceddata channel 290. - Turning now to
FIG. 3 , a flow diagram illustrating the interoperation of one of theNode Bs 130 and one of theUEs 120 ofFIGS. 1 and 2 is shown. In the flow diagram ofFIG. 3 , theRNC 138 provides a signal (at 300) through theNode B 130 to align or synchronize the operation of theNode B 130 and theUE 120. In the illustrated embodiment,different Node Bs 130 that are assigned todifferent RNCs 138 are operating with different system clocks from theinstant RNC 138 andNode B 130. Therefore, to insure proper timing of signals between theNode B 130 and theUE 120, the first operation is to synchronize at least the communications between the two devices. In the illustrated embodiment, a synchronizing signal is transmitted by theNode B 130 over the shared channel, which in a UTMS corresponds to a Primary Common Control Physical Channel (P-CCPCH). - In the illustrated embodiment, the UE 120 (at 305) responds to the synchronization signal by aligning (or realigning) the timing of signals to be delivered over the control and data channel types 280, 270.
- The
UE 120 has data signals that it desires to transmit to theNode B 130. However, before theUE 120 is allowed to transmit data to theNode B 130, it must first request, and be granted, permission. Accordingly, the UE 120 (at 310) periodically sends a reporting signal over the control channel type 280 indicating that it has data/voice to be transmitted to theNode B 130. The Node B 130 (at 315) receives the signal on itscontrol channel 240, updates the status of theUE 120, indicating that theUE 120 is in the scheduled mode of operation and desires to transmit data. TheNode B 130 also determines certain information from parameters, such as quality and strength, of the signal received from theUE 120. For example, based on the quality and strength of the signal, theNode B 130 may determine that theUE 120 needs to adjust its transmitting power (increase or decrease). - The Node B 130 (at 320) responds to the request from the
UE 120 by delivering a signal over the sharedchannel 220, granting permission to theNode B 130 to deliver its data over the enhanceddata channel 290. Assuming that a plurality ofUEs 120 have requested to send data to theNode B 130, theNode B 130 grants permission to each of theUEs 120 to transmit their data within a preselected slot, where the timing of the slot is based on the synchronizing signal. For example,UE 120a may be granted permission to deliver data in time slot 1 andUE 120b may be granted permission to deliver data in time slot 2. - The
Node B 130 may use information obtained from theUEs 120 in determining the order and timing of the data to be sent from each of theUEs 120. For example, theNode B 130 may use information derived from a prior signal or signals received from theUEs UEs - Because the
UEs 120 may be at different locations, and thus different distances from theNode B 130, the length of time that it takes for a transmitted signal to travel from theNode B 130 to theUE 120 and back may vary. Additionally,different UEs 120 may have different operating speeds and characteristics, such that their response times may differ, further contributing to variations in the timing of signals delivered from theUEs 120 to theNode B 130. That is, the propagation time for signals transmitted between theNode B 130 and theUEs UEs 120 are typically mobile, the propagation time may vary substantially over time. This variable propagation time, if not accounted for, may produce undesirable results, such as unacceptable overlap between uplink signals. - A timing diagram illustrating an exemplary overlap condition between data transmitted to the
Node B 130 from theUEs FIG. 4 . In the illustrated embodiment, theNode B 130 serially providessignals UEs UE 120 a is positioned a first distance from theNode B 130 such that when theUE 120 a begins transmittingdata 420 to theNode B 130, it will be received at thenode B 130 after a propagation delay t1. Similarly, theUE 120 b is positioned a second, different distance from theNode B 130 such that when theUE 120 b begins transmittingdata 430 to theNode B 130, it will be received at theNode B 130 after a propagation delay t2. In the illustrated embodiment, the data signals 420, 430 overlap one another for a time period t3. During this overlap period t3, the data signals 420, 430 may interfere with one another causing data to be lost. - The instant invention attempts to eliminate, or at least reduce, the overlap period t3 while minimizing, or at least reducing, the period of time between data transmissions from the
UEs Node B 130 uses anticipated propagation delays associated with theUEs data transmissions Node B 130 determines or estimates the propagation delay associated with theUE 120 a, and then uses that propagation delay in determining the time at which to allow theUE 120 b to begin transmitting. In one embodiment, the process of determining or estimating propagation delays may be repeated each time a signal is received from theUEs 120. In this way, the dynamic nature of propagation delays may be detected and accounted for in scheduling theUEs 120 to deliver data. - Returning to
FIG. 3 , the UE 120 (at 325) examines the signal from theNode B 130 and determines the time slot in which it is to transmit data over the enhanceddata channel 290. In one embodiment, theNode B 130 provides a signal commonly referred to as the system cell number (SFN) along with a unique offset associated with eachUE 120. The unique offset indicates the slot in which the associatedUE 120 is permitted to transmit data. For example, theUE 120 a may receive the SFN along with an offset of 1, while theUE 120 b receives the SFN along with an offset of 3. Thus, theUEs - Thus, at the appointed time, the UE 120 (at 330) begins transmitting its data signal or packet over the enhanced
data channel 290. At substantially the same time, theUE 120 may also transmit a signal over the control channel 280. TheUE 120 may use the control channel 280 to indicate parameters associated with the signals being provided over the enhanceddata channel 290. TheNode B 130 may use the information provided on the control channel 280 to decode information received on the enhanceddata channel 290. - The Node B 130 (at 335) receives the information provided over both the enhanced data and
control channels control channel 240 is decoded and used to decode the data signal provided over the enhanceddata channel 290. The decoded data signals are then forwarded through theinterface unit 200 to the various components of thesystem 100. TheNode B 130 also “knows” the slot in which it should receive data over the enhanced channel from each of theUEs 120. TheNode B 130 may then compare the actual time that it receives data from theUE 120 with the scheduled time, and any variations may be attributed to propagation and/or processing delays and used by theNode B 130 in scheduling future transmissions from theUEs 120. - The delay associated with the
UE 120 may be used to control the scheduling of uplink transmissions from theUE 120, or, in the alternative, theNode B 130 may compensate for the delay. In a first embodiment, theNode B 130 may elect to not schedule an uplink transmission from any of theUEs 120 following an uplink transmission from theUE 120 with the known delay. In this way, overlapping uplink transmissions from theUEs 120 may be eliminated or at least reduced. For example, assume theUE 120 a transmits uplink information without significant delay, whereas theNode B 130 has received uplink information fromUE 120 b significantly later than scheduled. TheNode B 130 may schedule theUEs UE 120 b transmits its information in slots 2, 5, 8, etc. it will not overlap with data transmitted in slots 3, 6, 9, etc., as no information is being transmitted in those slots. - Alternatively, the
Node B 130 may attempt to alter the time at which theUE 120b is permitted to transmit. For example, if theNode B 130 “knows” that it receives information from theUE 120 b 5 msec after the scheduled time, then it may instruct theUE 120 b to begin transmitting uplink information 5 msec early. There are at least two ways in which theNode B 130 may instruct theUE 120 b to transmit early. In a first embodiment, theNode B 130 may provide a unique synchronization signal to theUE 120 b. In this embodiment, the unique synchronization signal for theUE 120 b would lead the synchronization signal for theUE 120 a by approximately the “known” delay associated with theUE 120 b. That is, theNode B 130 may provide a unique synchronization signal to eachUE 120 to compensate for any detected delays associated with each of theUEs 120. - Alternatively, the
Node B 130 could provide a universal synchronization signal but also include an offset for each of theUEs 120, where the offset corresponds to the measured delay associated with eachUE 120. For example, assuming that theUE 120 b has a 5 msec delay associated with its uplink transmissions, then theNode B 130 may advise theUE 120 b to transmit uplink information in slots 2, 4, 6 but with a 5 msec offset. Thus, theUE 120 b would begin its uplink transmission 5 msec prior to the beginning of slot 2, 4, 6. Owing to the 5 msec delay, however, theNode B 130 will not receive the uplink transmission until at about the beginning of slots 2, 4, 6. - Those skilled in the art will appreciate that the various system layers, routines, or modules illustrated in the various embodiments herein may be executable control units (such as the
controllers 210, 250 (seeFIG. 2 )). Thecontrollers 210, 250 may include a microprocessor, a microcontroller, a digital signal processor, a processor card (including one or more microprocessors or controllers), or other control or computing devices. The storage devices referred to in this discussion may include one or more machine-readable storage media for storing data and instructions. The storage media may include different forms of memory including semiconductor memory devices such as dynamic or static random access memories (DRAMs or SRAMs), erasable and programmable read-only memories (EPROMs), electrically erasable and programmable read-only memories (EEPROMs) and flash memories; magnetic disks such as fixed, floppy, removable disks; other magnetic media including tape; and optical media such as compact disks (CDs) or digital video disks (DVDs). Instructions that make up the various software layers, routines, or modules in the various systems may be stored in respective storage devices. The instructions when executed by thecontrollers 210, 250 cause the corresponding system to perform programmed acts. - The particular embodiments disclosed above are illustrative only, as the invention may be modified and practiced in different but equivalent manners apparent to those skilled in the art having the benefit of the teachings herein. Furthermore, no limitations are intended to the details of construction or design herein shown, other than as described in the claims below. Consequently, the method, system and portions thereof and of the described method and system may be implemented in different locations, such as the wireless unit, the base station, a base station controller and/or mobile switching center. Moreover, processing circuitry required to implement and use the described system may be implemented in application specific integrated circuits, software-driven processing circuitry, firmware, programmable logic devices, hardware, discrete components or arrangements of the above components as would be understood by one of ordinary skill in the art with the benefit of this disclosure. It is therefore evident that the particular embodiments disclosed above may be altered or modified and all such variations are considered within the scope and spirit of the invention. Accordingly, the protection sought herein is as set forth in the claims below.
Claims (22)
1. A method, comprising:
associating a delay with a request to transmit information; and
transmitting a signal identifying a time at which information is permitted to be transmitted based on the delay.
2. A method for controlling a flow of information, comprising:
receiving a signal requesting to transmit information;
associating a delay with the request to transmit information;
determining a time at which the information is permitted to be transmitted based on the delay; and
transmitting a signal identifying the time at which information is permitted to be transmitted.
3. A method, as set forth in claim 2 , further comprising:
transmitting a synchronizing signal, and wherein transmitting a signal identifying the time at which information is permitted to be transmitted further comprises transmitting a signal identifying the time as a function of the synchronizing signal at which information is permitted to be transmitted.
4. A method, as set forth in claim 3 , wherein: transmitting the signal identifying the time as a function of the synchronizing signal at which information is permitted to be transmitted further comprises transmitting over a shared channel the signal identifying the time as a function of the synchronizing signal at which information is permitted to be transmitted.
5. A method, as set forth in claim 2 , wherein transmitting a signal identifying the time at which information is permitted to be transmitted further comprises transmitting a signal identifying a frame in which information is permitted to be transmitted.
6. A method, as set forth in claim 2 , wherein associating a delay with the request to transmit information further comprises determining a propagation delay.
7. A method, as set forth in claim 2 , wherein associating a delay with the request to transmit information further comprises determining a processing delay.
8. A method, as set forth in claim 2 , further comprising:
receiving the information at a first preselected time;
comparing the first preselected time with the identified time to determine the delay associated with the request to transmit information.
9. A method for controlling a flow of information from a user to a base station, comprising:
receiving a signal from the user requesting to transmit information;
associating a delay with the user;
determining a time at which the user is to transmit the information to the base station, wherein the determined time is a function of the delay; and
transmitting a signal to the user identifying the time at which information is permitted to be transmitted.
10. A method, as set forth in claim 9 , further comprising:
transmitting a synchronizing signal to the user, and wherein transmitting a signal identifying the time at which information is to be transmitted further comprises transmitting a signal identifying the time as a function of the synchronizing signal at which information is permitted to be transmitted.
11. A method, as set forth in claim 10 , wherein:
transmitting the signal identifying the time as a function of the synchronizing signal at which information is to be transmitted further comprises transmitting over a shared channel the signal identifying the time as a function of the synchronizing signal at which information is to be transmitted.
12. A method, as set forth in claim 10 , further comprising a plurality of users, and wherein:
transmitting the synchronizing signal further comprises transmitting the synchronizing signal over a shared channel to each of the plurality of users; and
transmitting the signal identifying the time as a function of the synchronizing signal at which information is to be transmitted further comprises transmitting over the shared channel to the plurality of users a signal identifying a unique time, as a function of the synchronizing signal, at which information is to be transmitted.
13. A method, as set forth in claim 9 , wherein transmitting a signal identifying the time at which information is to be transmitted further comprises transmitting a signal identifying a frame in which information is to be transmitted.
14. A method, as set forth in claim 9 , wherein associating a delay with the user further comprises determining a propagation delay associated with signals delivered by the user.
15. A method, as set forth in claim 9 , wherein associating a delay with the user further comprises determining a processing delay associated with signals delivered by the user.
16. An apparatus, comprising:
means for receiving a signal requesting to transmit information;
means for associating a delay with the request to transmit information;
means for determining a time at which the information is permitted to be transmitted based on the delay; and
means for transmitting a signal identifying the time at which information is permitted to be transmitted.
17. A method for controlling the flow of information between a user and a base station, comprising:
transmitting a signal from the user requesting permission from the base station to transmit information;
associating a delay with the user;
determining a time at which the user is to transmit the information to the base station, wherein the determined time is a function of the delay; and
transmitting a signal to the user identifying the time at which information is permitted to be transmitted; and
transmitting the information from the user to the base station at the identified time.
18. A method, as set forth in claim 17 , further comprising:
receiving the information from the user at a first preselected time;
comparing the first preselected time with the identified time to determine the delay associated with the user.
19. A method for controlling the flow of information between a user and a base station, comprising:
receiving a synchronizing signal from the base station;
transmitting a signal from the user requesting permission from the base station to transmit information;
receiving a signal from the base station identifying a time relative to the synchronizing signal at which information is to be transmitted; and
transmitting the information from the user to the base station at the identified time.
20. A method, as set forth in claim 19 , wherein:
receiving a signal from the base station identifying the time at which information is to be transmitted further comprises receiving a signal from the base station identifying a substantially unique time at which information is to be transmitted.
21. A method, as set forth in claim 19 , wherein:
receiving a signal from the base station identifying the time at which information is to be transmitted further comprises receiving a signal from the base station identifying a substantially unique frame associated with the synchronizing signal during which information is to be transmitted.
22. A method, as set forth in claim 19 , wherein:
receiving a synchronizing signal from the base station further comprises receiving a synchronizing signal from the base station over a shared channel.
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JP2004237817A JP2005065301A (en) | 2003-08-18 | 2004-08-18 | Uplink timing in wireless communication system |
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US20040224686A1 (en) * | 2003-05-08 | 2004-11-11 | Pedlar David W. | Apparatus and method of uplink data during cell update in universal mobile telecommunications system user equipment |
US20050047393A1 (en) * | 2003-08-26 | 2005-03-03 | Jung-Tao Liu | Method and control channel for uplink signaling in a communication system |
US20050195826A1 (en) * | 2004-03-08 | 2005-09-08 | Surf Communication Solutions Ltd. | Multi-parameter scheduling in communication systems |
US20070086457A1 (en) * | 2003-12-22 | 2007-04-19 | Johan Rune | Arrangements and method for handling macro diversity in utran transport network |
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Also Published As
Publication number | Publication date |
---|---|
EP1513367A2 (en) | 2005-03-09 |
KR20050020619A (en) | 2005-03-04 |
EP1513367A3 (en) | 2005-04-06 |
JP2005065301A (en) | 2005-03-10 |
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